用[H+](表示氢离子浓度)的负对数来表示溶液的酸碱度,该负对数就叫pH值。
参考答案:对
根据短文内容和首字母提示完成空白内所缺单词。
Kate Smith (1) ______ a student. She (2)______ a brother and a (3) ______. (4) ______ names
are Jack Smith (5)______ Jenny Smith. (6) ______ all like sports. Kate (7) ______ basketball. Jack
likes soccer and Jenny likes baseball. Their mother gives (8) ______ lots of healthy (9)______ every
day. She thinks (认为) they should (应该) (10) ______ well, because (因为) they do lots of sports
every day.
1._____ 2._____ 3._____ 4._____ 5._____
6._____ 7._____ 8._____ 9._____ 10._____
不属于修复前口腔一般处理的是
A.处理急性症状如牙槽脓肿
B.制取模型进行修复前研究
C.保证良好的口腔卫生
D.拆除不良修复体
E.治疗和控制龋病及牙周病